A009142 Expansion of e.g.f. cosh(sin(sin(x))), even powers only.

1, 1, -7, 73, -687, -19471, 2839561, -260138759, 22560194593, -1856685484703, 115492830956953, 5211807618131753, -4918276086306813839, 1664523472944706933841, -477486870436056568353623

Offset

0,3

Links

G. C. Greubel, Table of n, a(n) for n = 0..250

Maple

seq(coeff(series(factorial(n)*cosh(sin(sin(x))), x, n+1), x, n), n=0..30, 2); # Muniru A Asiru, Jul 31 2018

Mathematica

With[{nmax = 60}, CoefficientList[Series[Cosh[Sin[Sin[x]]], {x, 0, nmax}], x]*Range[0, nmax]!][[1 ;; -1 ;; 2]] (* G. C. Greubel, Jul 30 2018 *)

Prog

(PARI) x='x+O('x^60); v=Vec(serlaplace(cosh(sin(sin(x))))); vector(#v\2, n, v[2*n-1]) \\ G. C. Greubel, Jul 31 2018

Crossrefs

Sequence in context: A308418 A240195 A025592 * A155614 A113033 A093675

Adjacent sequences: A009139 A009140 A009141 * A009143 A009144 A009145

Keyword

sign

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Status

approved